In quantum cryptography, CHSH game is used for testing the device independence of the protocols. Precisely, \(0.85\)  probability certifies the existence of maximally entangled state amongst the legitimate parties [1]}, [2]}, [3]}, [4]}, [5]}, [6]}, [7]}. If the shared states are maximally entangled, then from the monogamy relation of entanglement [8]}, [9]}, [10]}, it is guaranteed that the information about the raw key extracted by an eavesdropper, generally familiar as Eve, can not be greater than the information extracted by Bob (one of the authenticated parties).
